HI, i have an Inspiron 15 7000 laptop.

I want to remove hole windows to moving to linux (windows is disgusting in my mind),

but this is one thing between me and linux, MY PARENTS, i think after two years i should give my laptop to them and i don't want to pay for windows again, is there a way to save my activation key of windows and reuse it when i need it?

and also is it safe to wipe the bios partition or not?(for recovering windows after a while)